Sand-jffioldxng apparatus



April 14, 1925.

`1,533,221 D. J. CAMPBELL SAND HOLDING APPARATUS Filed Feb. 26, 1923 3 Sheets-Sheet 1 Inuen'bv Donau) .Gumpgll j Bfwum Affornerg;

.April 114, 192s.

- 1,533,221 D. `1.c:.\n,1|=|:-:|..L

SAND MOLDING APPARATUS Filed Feb. 2e. 192:5 :s sheets-sheet 2 f .30v K- (mornegg April 14,1925.A f l 1,533,221

- D. J. CAMPBELL 7" SAND HOLDING APPARATUS Filed Fb. 26, 1923 3 Sheets-Sheet 3 Donulddompm- Patented Apr. 14,k 1925.

yDomina .TQ CAMPBELL, or MUSKEe-o-u irme-irre, yMinermi-offrir.

vSAND1M(BEIJING APPARATUS.

use in molding, being par Cerned with L machine Whe jeoted into :i giistsl ,to till and pack `dzliie saune mound a :pattern in ,the husk by .dilemas .of ve ,impresseed oir, one salient feature fO-. jl

present invention yheilig in tthe.filling yfoi the ,flask in. zi vplurality or number oprojections ,off Saud tl1ereiuto,a part `only ogt'vthe and needed for lilliug the flask ibeiii-g p o1', ed thereinto et ezt-ch troie. l'lhere the ,fl `(e are ot' considerable depth, l have found ,zit in filling ,thegezime completely ,at Aone dis- 4clrargje' of smid iuider theihfluehoe of @our pressed air, the smid is not paokedfis Lclosely :is it Should be particularly yin the 11pper part of the fla-sk. Accord' y, l heme 1derVised .a yoonatmet,ion and ,method ,of flask illi-ng wherein ,a number l et projeotiohe ,of sund are mudeiiito the ila-eli, gett' 1g the required .densityT of sand `the entire mould hai-S for lits jpI'iniery ,object fend purpose the provision of apparatus Pfor `efe@tively @5u-ryiu. lout ythis methodof flask lilloing, Various novel mroustruetious end errugemente ,of parte boing provided rtherefores will. r pear from `the 'following desoription, ,taker in muuectioii with ithe ,accompanying drawings, in Whieh.

Fi l luout elevation lein h odviu the ifm/enti on.

' Fig'. 2 is*l a liolzolital .Section taken stmitiallylon'the pzluueoff lime 2- o, .of fl and look-ing dowmwgrr-d-ly usuiudicgited .by the arrows. e f

Fig. 3 is a `fragfl'iientary .enlarged ,View ,partly in elevation :md partly in :Sectionyot Mie `Saud hopper carrying and icortrolliiug ,menue used, and f F l is .im enlarged vertice-l -,eatiou tlrrougrh .the Ynmcl'ii-ne `with the seetion be from `trout tothe rear thereof.

of theeppergtus n send isl pro# flier 8 :is securedehoveifmld 1on wliioln L Ior Collar k9 is ,i-iiounted, this coller l .12 kis, rotatablyy me f end `out the ,Gellar l', 2.

y n rods L? 21nd 15,il1zL-Wing yertiogrl; and .making perfect moulds. My invention upper portions v(.)ffrj'he qsar-id roel ,emi in md fthe 'other :below the beam, whereby .the

ufliirh is carried on the :upper Like relferolices refer to like gpzri;s in the dii'iereut ,figures `of the dif-@Wiege K In .the .colietruotiorsl .of the appareil@ 11 relatively heavy @long d 'l vided, etoile @iid of :i .upwardly for te distance,

met; ex

ted, Vbeure' gustablym Y ed by a. binding fisleeve 4e isa m `any place ,to which adjust bolt -asfshowi ,in Fig-1. ,osleere or colle-r 65 5 is rotatably ted ,ogn .and fai-b .e the ksleevee, will r hei" es inel'eatefl ,beiiig interpoee u en gtheths md Acepto covers theupper end ofthe sleeve tithe opposite end o-fl'l hase 15e y1r br cated around L prost ,lOSinilgrr -oft;,hf.-i y ed Ep'ost 3 vpreviously Guti ed.' .A CO er l, -lilie collar 4 :is adjuthhl-y mounted ,on lthe poet lOon the upper end .of which o eol'lar t 5L, alike coller 1 3 argini,rietr the upper A covering oep lll comers the upper endof the Acollar 13 Aiid je oli-ed gthfer o. A cross :bezem 1,6 is rd1sposati b QCDIQL i* i itsv ends through which the rods .1 The @te threaded s L7 are located theljon one .above side .fr ,sand hopper lica-rrying; yoke of .Shape is Secured, :each Vincluding e peut 1.9 Wlrieh-lies agamgt ,ein-d is Vsecured to i Isido ,of the blookflS and two speced :apa-rt youtwardly extending parallel arms 20. The send lh oppere, ythree-111 1111113113131, aesocurted with smdyokes eaoh,includezuiouter frame '251 which iS positioned between the ernia v 2,0 oud in riront of the Xpert 19. Ears 22 (gu-st inte, Orzrlwith the iramehme openiu theretlir( qui for Jtue entrance fof pir-1gb ,i3 one of ide und at lon the free end of each arm 20 and another on the upper side of the part 19 substantially midway between its ends. The sand hopper frames are accordingly detachably connected `to their yoke supports and the saine may be slightly elevated with respect to said snpports without disconnect-ing therefrom, as is necessary in the operation ot the apparatus, as will later appear. Each hopper is completed by a plurality ot cross bars Qriextending between the sides of the frame et the hopper and being in parallelism with the other sides, the bars 24: crossing each other whereby a plurality of openings are made for the passage of sand, but the. bars themselvesserve as a grate to hold the sand from free passage therethrough. rllhe bars are tapered to an edge at their upper portions and on their under sides are or rounded or curved form as shown.

A bracket arm 25 is permanently secured to the post 2 and extends upwardly and ontwardly therefrom, at its free end terminating in a sleeve 26, vertically positioned through which a vertical rod or post Qi" freely passes. rfhis post carries a table 28 at its upper end, the upper side of which is groovedor recessed so that it tits closely against and receives the lower edge portions of the bars 24 when elevated against the same as shown in Fig. 3. An arm 26a is cast integral with the sleeve 2G and entends downwardly therefrom to the lower end ot which a'lever 29 is pivotally mounted between its ends. @ne end of the lever has a pivotal connection to the post 27 at its lower end, and to the other end of the lever a link rod 30 is pivotally connected at its upper end, extending downwardly to and having pivotal connection to a foot pedal 31 which is pivotally connected to a bracket 32 lined on the base 1 at one end thereof. On depressing the foot lever the table 28 is elevated and may be brought against the under side of any sand hopper which is moved to lie directly overthe table, closing the hopper at its lower side or during the time that sand is dropped into the hopper from above, as will later appear, thus stopping any passage of the sand through the hopper.

An integral boss or post 33 extends downwardly from the beam l5 (see Fig. 3), having a ball carrying sleeve Sli lined therein at its lower end in which a ball is located, normally pressed downward by a spring, as shown. The cap plate 6 has a notch or opening out in one side 'for the passage of the lower end of the post 33 to permit the ball to ride against the upper end oit the sleeve 5 which, at three equally spaced apart pointsy is formed with recesses 36 into which the ball may enter. This makes a yielding latch construction for holding the hopper carrying construction in proper positions during the times that the hoppers a re being Vfilled with sand and when they are having the sand forced therefrom by compressed air.

@n the upper side of the base l and between the 'posts at the ends thereof, a cylindrical member 37 is secured having an open upper end and screw threaded at its outer sides on to which an interior-ly threaded sleeve 38 is screwed. A plate 39 is placed over the upper end of the sleeve 38 and conand extending upwardly therefrom andA having pivotal connection to ribs e5 on the lower side of a table d6. From this table a relatively long vertical sleeve 4T extends downwardly and is guided through a vertical sleeve #L8 formed with the plate 39, it bein@` evident that on straightening of the toggle links, the table Li6 is elevated. rod passes vertically through the sleeve 47 andthrough an opening in the table, at its lower end having connection to an aim 50 which is lined on a horizontal shaft 5l mounted to pass through the sides of the member 37, at its outer' end having a toot lever or pedal 52 fixed thereto lor operation to elevate the rod 49. A protective skirt 53 of sheet metal is attached to the table 4G and extends downwardly to cover the toggle link mechanism, operating means therefor and the devices under the same from sand falling to the saine, as shown in Fig. el.

From the collars l2 and 18 yoke arms 3f-l aiuL extend terminating in sockets 56 for the reception ot trunnions 5"? which project outwardly from the sides 58 oi flask carrying members, which are completed by bottoms 59 from which the sides entend upwardly. secured to a base board 6l are secured, and flasks 652 are adapted to be detachably clamped to said boards 61 in the operation or filling the same with sand. lt will be noted that the arms 5st and 55 extend upwardly and downwardly at an angle to the horizontal so that the sockets 56 are in the saine plane and the bottoms 5f) of the riask and pattern carrying members are in the saine plane. Said bottoms are each provided with a recess G3 in its under side into which the upper end oi' the rod 4:9 may be inserted when a llask carrying member is brought over the table lll, serving to proporly locate the i'lask and hold its carrying member in place for the succeeding operation of flask lling. The ilask carrying members are rotatable so that the same may Un these bottoms the patterns 60 be turned over, latch members 64 being mounted on one ot thev arms 54 and 55 of the two yokes adapted to enter openings 65- in a side 58 of the lask carrying members to hold the saine in either position to which it is turned.

The flask 62 is adapted to be located on its carrier over table 46 and when in such position the sand hopper trames 21 are moved in success-ion to positions directly over the upper endk ot the flask. gli rubber gasket or packing member 66' is secured on the under edges ot each ot the hopper trames 21 so as to come directly over the upper end ot the llask to closev the jointbetween the flask and hoppen trame when the table i6 is elevated. integrally formed with the beam 16 is an air reservoir 67, substantially cylindrical in format the lower end ot which is a heavy ring` 68 on the under side of which a second gasket 69 is secured for closing` the joint between the said ring and the hopper 'trame 21 which is brought directly under it in position to have the sand projected therefrom into the flask. rlhe ring` 68 has its, interior space partly filled by a plurality of cross bars 70 of substantially triangular cross section, whichI cross each other whereby a plurality ot passages il are made tor the escape ot air from the air reservoir, said openings progressively enlargino.` downwardly as shown. Valves 72, one tor each passage 71 normally close the upper ends ot' the passages. All or the valves are carried on a head T3 secured at the lower end of a rod 74 which extends upwardly through the upper end olf the air reservoir. rlloggle links 75 are pivotally connected together and the lower links pivotally connected to links 7 6 on the beam 16, the upper ends ot the upper links connecting` with the rod 74. A member 77 is connected with the knuckle pivot olf these toggle links, to which a piston rod 7S is secured, the rod passing into a cylinder '.79 and having` attachment to a piston therein. @poration of the piston in either direction momentarily raises the head 73 and attached valves 72 and allows the escape of air through the passages 71,'as is obvious.

A valve casing 8O has branc-h pipes leading to opposite ends ot the cylinder 79. An inlet pipe S1 carries the air to the valve casing. By means of a suitable valve rotatably mounted in the valve casing the air may be directed to either end of the cylinder. This valve is operable by a lever 83 to the outer end ot which a rod Se is connected, the same having` an operative connection with a bar 65 which at its lower end is pivotally connected to one end ol arm S6 ot' a bell crank handle lever, the other arm 6'? of which is formed at'its free end with a handle 'for manual operation. The bell crank lever is mounted for pivotal move-` ment and associated with it is an eccentric 90, movable with the lever, from the lower sides oJt the housing for which eccentric an arm 88 projects having operative connection with an exhaust valve structure 69 tor ei;- hausting the air through the side or' the ring 68 a'tter sand projectioninto the flask has been made. Flhe structure described tor controlling the air to the sand hoppe' is old in a tormer application forv patent by me and forms no part ort the presentr inven- `tion and is not specilically outlined in detailiior that reason. Only eno-ugh is shown to illustrate a practical and operative means for controlling the passage ot the air through the passages 71.

in air cylinder 91 has its lower end pivotally connected at 92 to a bracket support 93 lined to a side or' the base l and is positioned substantially vertical, shown in Fig. 4. piston rod 9-l enters the upper end ot the cylinder, l-iavinp,` connection to a suitable piston within the cylinder and at its upper end is connected to a member 95 at the louter end thereot which at its inner end has connection to the lower pivots ol thelower links li-2 ot the toggle rlinks at the adjacent side of the machine and to the pivot rod all, whereby on movement ot the rod Slupwardly or downwardly, rthe links are moved inwardly or outwardly with a consequent lowering or ,raising oit the table itl A bar lle connects the knuckle rods and makes the operation of the toggley links simultaneous.

Air carrying pipes 96 carry air into the upper and lower ends or the cylinder 91, the same oo nnectimgr with opposite sides 'or a. valve casing 97 to which compressed air is carried through an inlet pipe 98, the e2;` haust outlet pipe 99 beingv at the opposite side of the easing. The valve is operated through a lever 1GO connected therewith to the outer end of which a link 101 is pivotally connected, extending upwardly and forwardly therefrom and terminating in an oper-ating' handle 102 (see Fig. 1), readily accessible from the 'front of the machine. rllheair may be directed to either end ot the cylinder to either raise or lower the table 46.

The sand for tilling` the sand hoppcrs is delivered thereto through an outlet spout 103 at the lower end of asand holding bin 104e, the lower kend of the spout being' normally closed by closing` members 165 pivotally mounted on the spout and having` geared connection for simultaneous opening or closing movement. The-y are normally held closed by the weight shown .in Fig. l and may be opened by lifting the weichtand arm on which it is mounted, allowing sand to tall until the hopper is i'illed.

in arm 106 extends outward from the.

lOO

llO

sleeve 9, at its outer end terminating in a vertical sleeve 107 in which a post 108 is mounted for vertical adjustment through operation of a handle 109. The post carries a levelling table 11() on to which the filled flask is to be delivered from the flask carrying members of the apparatus. rl`his levelling device also is no novel part of the present invention being fully disclosed in a prior application for patent filed by me.

In the operation of the apparatus, the flask holding member carried between the yoke arms 54 or 55 is brought over the table 46 and centered thereon and properly positioned by bringing the upper end of rod 49 and the recess 63 into conjunction as described. Sand is dropped into a hopper, the table 28 first being elevated against the under side of the hopper, as shown in 3, the table being then lowered and the hopper moved so as to come directly over the flask and under the air reservoir. rlliis brings another hopper to filling position over table 2S and the saine may be filled while the one already filled is being` discharged into the flask After placing over the flask, handle 102 is grasped and operated to turn air into the cylinder 91 to elevate the table d6. This raises the flask carrying member against the hopper frame and the hopper against the ring 68, compressing the gaskets 66 and G9 and making tight joints so that air cannot escape at the joints. rlhe elevation of the flask carrying members is permitted by reason of the loose bearing of the trunnions in the sockets 5G, and the ears 22 on the hopper frame 21 may be raised a short distance on the pins 23 Without disconnecting therefrom. The handle 8T may then be grasped and the bell crank operated to lift the valves Y2, allowing the discharge of air against the upper side of the sand in the hopper, the sand being projected with force into the flask around the pattern, as its evident.

lVhen one hopper has had its sand discharged, the table 46 is lowered by properly controlling the air passing into cylinder 91, and a second filled hopper brought into place and the operation repeated. After this hopper is discharged, the third one is brought into position and its contents of sand discharged into the hopper. 0f course the number of discharges of sand will vary with the depths of the hoppers, but the intent of the invention is tor fill the flasks with a plurality of discharges whereby the sand is properly packed in the flask and around the pattern.

`When a flask is entirely filled, it may be struck off and the flask carrying member With flask attached turned as a Whole to above the levelling table 110, the other flask carrying member with empty flask thereon taking the place of' the first one. The flask carrying member is then turned over, inverting the filled flask, the levelling table 110 elevated against the under side thereof and levelled against it, locked in position, the flask unclainped from the board andthe table lowered drawing the flask and mould therein from the pattern. ln the meantime the other flask is beine; filled and is brought over the levelling table when filled for taking the flas r and mould, the operation being continuous. y

The construct-ion is very practical and with it moulds filled with sand of proper density may be produced rapidly and in quantity. i large number of flasks are rcquired, one for every mould made, but otherwise the apparatus requires no additions. Flasks of any desired depth Within the limits of the machine may be filled, the plurality of discharges of sand with force into the flask packing and tamping the sand to the required and proper density. The apparatus is easily operated and is practical and efficient in all respects. The appended claims define the invention and l consider the invention to comprehend all forms of construction coming Within the scope of said claims.

l claim:

1. ln an apparatus of the class described, a support, a inovably mounted table on the support, an air reservoir located a distance over the table, a flask carrying member mounted for movement to and avfay from the table and adapted to carry a flask and pattern therein, a plurality of relatively shallow sand hoppers movably mounted to be moved in succession between the flasl and the air reservoir, means normally closing the air reservoir at its lower end, and neans for momentarily opening said reservoir at its lower end to project the sand from any hopper into 'the flask, a plurality of charges of sand from the hoppers being required to fill the flask.

in an apparatus of the class described., a flask holding member adapted to carry a flask and a pattern therein, a post located at one side of the flask holding member, a collar mounted on the post to turn about the same in a horizontal plane, a plurality of Ushaped yokes projecting from the collar, a sand hopper for carrying sand carried detachably by each yoke and movable into position over the flask, yielding latch means acting on the collar to hold the same against rotation when a hopper is over the flask, and means for applying compressed air to the sand in a hopper to project the same from the iopper into the flask, substantially as described.

3. In an apparatus of the class described, a support comprising a base, spaced apartl posts extending upwardly from the ends of the base, a flask holding member mountbill Li o

lll?) llO ed on onel oil the posts to turn about in a horizontal plane, a collar mounted to rotate about the other post, a plurality of U-shaped yoles extending from the collar, a sand hopper traine carried byeach yoke,

said traine having a grate construction tlierein to norn'ially hold sand from passing therethrough, a beam disposed between the upper end portions ot the posts, a boss enm tending downwardly from the beam to'` member, and means Carried by the bcam` tor applying compressed air to the upper surface ot' the sand in a hopper over a vtlasli' to project the sand into the flask, sub stantially as described.

4. ln an apparatus ot the class described, a vertical post, a collar thereon, all-shaped yoke extending horizontally therefrom, said volte having parallel outwardly projecting arms connected at their inner ends by a cross member, a pin extending upwardly trom the end ot each arm and also trom the cross member at a ypoint between its ends, a sand hopper tiainelocated betwen the arms and in front ot' the cross meinber ot the yoke, ears on said .traine having` openings through which the pins pass, and a grating construction in the lower part ot the iframe tor normally holding` sand troni passing through the hopper, substan- (,ially as described. y

ln an apparatus of the class described, a vertical post, a collar rotatably mount ed thereon, a yoke extending horizontally it'rom the collar, a sand hopper trame carried by the yoke and provided with a grating construction at its lower portion, an

arm entei'iding outwardly from the post,

a rod mounted for vertical 'movements at the end ot th-e arm, a table at the upper end ot the rod shaped to tit the under sido ot the grating construction in the hopper, and toot operated means tor elevating` the rod and attached table to bring the table into operative conjunction with the under side of the said grating construction.

In an apparatus of the classv described, a base, a supporting member thereon, plate carried on and above said member, a table, toggle link connections between the table and said plate whereby when thelinlrs are brought into aliiieinent theftable is elevated, a shaft mounted horizontally through said supporting member, a foot pedal on an end vot tlieshatt, an arm on the shaft within said member, a rod attached to the arm and extending vertically through the table, a tlaslr holding member mounted to move in a horizontal plane over the table and provided with a recess in its under` side to receive the upper end of the rod,

and means tor operating` said toggle links to elevate the table, substantially as described. Y. ln an apparatus ot the class described,

a base, a vertical cylindrical member attached to the base between its ends,said member being ente-riorly threaded, an iiitei'ioily threaded sleeve mounted on said n ieiiibei,k a plate located across the upper ends ot the member and sleeve and :termed ,with a downwardly extending cylindrical guide to enter said cylindrical member and also formed with a vertically positioned smaller guide sleeve substantially ycentral tliereot, a table located above the plate, an elongated vertical guide attached to the under side ot the table and extending downwardly through said smaller guide sleeve, toggle links disposed between the table and plate,A and means tor operating said links to raise or lower the table with respect to the plate.

8. ln an apparatus of the class described, a table, tlaslr and pattern carrying members mounted for movement to and away trom the table, a :lined air reservoir located a distance above the table, a plurality of shallow sand hoppers mounted for movement kto pass under the air reservoir between it and a 'Flask on the flash carrying member, means 'torelevating the table toy clamp the flash and a hopger between the table and the air reservoir, and means for momentarily permitting the escape ot' compressed air from the air reservoir to project sand from. a yshallow hopper into the flask to partly lill the flash, substantially as described. i

'9. In an apparatus or" the class described,

a base, a table located a distance above the base, a plate supported adjustably by the base between the same and table, toggle vlinks between the plate and table, an air ture.

DONALD J. CAMPBELL. 

